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The influence of lead ions on the free radical concentration and the structure of humic acids isolated from soil, peat and compost was investigated by electron paramagnetic resonance (EPR), 13 C cross-polarization magic angle spinning nuclear magnetic resonance ( 13 C CP MAS NMR), Fourier transform infrared spectroscopy (FTIR) and chemical methods. A new type radical is formed...
Forty two samples of black soils were collected from superficial horizons of the High Altitude Rocky Complex (HARC) that is situated on top of the most prominent mountain ranges of eastern Brazil. Our objective was to characterize the humic acids extracted from these pedoenvironments and evaluate the effect of natural paleo-fires on thermogravimetric properties, elemental composition, visible and...
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